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But after I made new blocks for the cursor and gave the rule a good cleaning, it's back in good form. Interestingly, the fabric-wrapped cardstock case has no labeling, and the bottom of the cursor is imprinted "PAT. They switched to using celluloid blocks by 1916, probably due to costs, but possibly also because those two hunks of metal add a lot of weight to an otherwise light instrument.The rule features a table of formulas, constants and conversion factors on the reverse, exactly like the 1922 model below.

The top of the flap is marked: K & E (/) LOG LOG DUPLEX (/) SLIDE RULE. For information on the patents, see 322761, 318475, and 318479.

One owner of this slide rule was the mechanical engineer Edward Lincoln Heller (1912–2007), who received a BSfrom Lehigh University in 1934 and an MBA from Harvard University in 1939.

It is marked: KEUFFEL & ESSER (/) FAVORITE (/) SLIDE RULE (/) 4055. K&E sold model 4055 from 1927 to 1943; the serial number suggests a date closer to 1927, when the instrument sold for .00.

The 1921 K&E catalog describes this slide rule: The Favorite Slide Rules are of the same pattern as No. They are an improvement over the imported rules, being made of materials seasoned here and, therefore, less liable to warp or shrink.

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